I know how to draw this blocks in tikz, but I'm not sure if there is already some existing functionality providing an easy way to do this. I want to remove/add/style blocks in a simple way. I also want to put this in a rounded rectangle:

__________________
( \ \ \ )
(___/____/____/____)

A circular chain of arrows would also be nice to have.

If there is no existing solution I'm interested in suggestions how to create a good and reusable solution for this problem.

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WernerJun 5 '12 at 16:01